What is CVE-2026-106498?

CVE-2026-106498 is a high-severity vulnerability in @Backstage Plugin-Catalog-Backend, classified under Incorrect Authorization. CVSS score: 7.7/10. Published 2026-10-06.

How severe is CVE-2026-106498?

High severity. CVSS v3 base score is 7.7 out of 10.

Auth bypass in @Backstage Plugin-Catalog-Backend

CVE-2026-106498

Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.

Vulnerability class: Broken Access Control

Published 2026-10-06.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

@Backstage Plugin-Catalog-Backend — versions < 3.5.1, >= 3.6.0, < 3.6.2, >= 3.7.0, < 3.7.2
Backstage — versions < 1.49.6, >= 1.50.0-next.0, < 1.50.5, >= 1.51.0-next.0, < 1.51.3

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-106498?: CVE-2026-106498 is a high-severity vulnerability in @Backstage Plugin-Catalog-Backend, classified under Incorrect Authorization. CVSS score: 7.7/10. Published 2026-10-06.
How severe is CVE-2026-106498?: High severity. CVSS v3 base score is 7.7 out of 10.